I had a chance of trying it before the official launch, now using it 90% of the time while working with ChatGPT. It's a huge time saver.
Surprisingly enough, it taught me to prompt ChatGPT better, by allowing me to iterate on prompts in the sidebar, and seeing how small changes affect the result. Also, you get to feel its limitations much better.
It needs some polishing, but overall, highly recommend trying it out.